Vibratory screen



1941- e. A. ovERs'rR M ETAL 2,241,476

VIBRATORY SCREEN Fiied Aug. 18, 1959 INVENTOR. Gusfave A Over-ai Gorq Oversfrvm By c n rad Over from l- A ORNEYS.

Patented May 13, 1941 VIBRATOBY SCREEN Gustave A. Overstrom, Eagle Rock, Conrad Over-strum, Pasadena, andGeorge Overstrom,

Eagle Rock, Calif.

Application August 18, 1939, Serial No. 290,120

(or. zoo-sass) 4 Claims.

This invention relates to improvements in power driven vibrating screens of the type employed for sorting, grading and separating materials, including the treatment of rotary mud.

This invention is concerned with improvements in the construction and mounting of the vibrating unit when it is of the type which is mounted directly upon the screen box sons to move with it and is essentially a rotatable unbalanced weight.

An object of this invention is the provision of an improved form of mounting by means of which the vibrating unit may be quickly and easily mounted on the screen box and removed therefrom and is adapted for end to end reversal so that it may be driven from either the left or the right hand side of the screen.

A further object of the invention is the provision in a mounting of this type of means for insuring or locking the unit against undesired rotational movement and at the same time constructed and arranged to facilitate the removal thereof and angular adjustment when desired.

Another object of the invention is the construction of a housed vibrating unit and the mounting so that oil may be used for the lubrication thereof which may be easily removed for replacement and cleaning and the quantity of which may be readily gauged when refilling.

Among the other objects of this invention is the provision of an improved form of sealing means for the ends of the housing by which the leakage of oil therefrom is prevented.

Other more detailed objects of this invention will be apparent from the following description.

This invention resides substantially in the combination, construction. arrangement and relative location of parts, all as will be described in full detail below.

In the accompanying drawing- Figure 1 is a vertical, transverse, cross-sectional view t ough a screen box in accordance with this i vention, taken through the longitudinal axis of the vibrator unit:

Figure 2 is a left hand end elevational view of the vibrating unit and its mounting;

Figure 3 is an enlarged longitudinal-sectional view of the drive end of the vibrating unit, the shaft being held from endwise movement at this end only;

Figure 4 is a further enlarged, detailed, longitudinal-sectional view at the same end; and

Figure 5 is a longitudinal-sectional view of a vibrating unit in which the shaft is held from endwise movement only at the closed end of the housing.

As is notorious, power driven vibratory screens of the type disclosed herein and to which this invention refers when in use in the field are subjected to extremely destructive conditions. By way of example, when screens of this type are employed in the treatment of rotary mud it is apparent that the surface thereof becomes coated with the mud, causing the removable parts to become rusted and otherwise undesirably secured together. In the case of the treatment of dry materials it is apparent that great quantities of abrasive dust settle on the parts, which is not only destructive thereof but shortens the life of the structure if it gets between the removable parts. An object of this invention is to provide a vibrating unit of the type mounted on the screen box which may be readily mounted in place, removed for repair or reversal. and otherwise manipulated for maintenance purposes with ease, notwithstanding its condition resulting from use in the field.

It is common practice to lubricate devices of this type with a heavy grease which cannot be removed and replaced readily without completely disassembling the vibrating unit. Furthermore, no sure provision is made by means of which it can be determined when the proper amount of grease has been forced into the housing. The result is that it is common practice to employ a powerful grease-gun with which grease is forced into the casing until it oozes out of the labyrinth seals. The use of grease is disadvantageous for other reasons, such as in cold weather it is hard to get units of this type started, and in hot weather the grease tends to be beaten into a froth. In accordance with the construction of this invention, oil may be employed which.

can be easily removed and replaced, as will be explained later, by reason of the construction devised. and when replaced can be replaced in just the right amount.

Other objects of the invention include improved methods of sealing the vibratory unit housing and for holding the bearing members drawing. Mounted 'on the outer faces of the screen box walls are a pair of brackets 4 which are secured thereto in any suitable manner, as for exampleby welding. At their upper ends these brackets terminate in split collars 5 which are provided with a pair of parallel lugs 6 and 1 at the opposite sides of the division line and extending throughout the length of the collars.

These collars are provided with one or more holes, as shown, by means of which nuts and bolts 8 may be employed for locking the tubular housing 19 therein when the ends thereof lie in the collars. One of the lugs, such as the lug 6, on each collar. is provided with a central threaded opening 9 into which one of the bolts 8 may be screwed to engage the opposite ear for expanding the split collar slightly to break it loose from the housing l0 when it is desired to remove the housing for any purpose or angu larly adjust it. For example, it is frequently necessary to reverse the vibratory unit end for end so as to provide'for eitherv left hand drive, as shown, or right hand drive when reversed. This construction facilitates these operations and is particularly effective in the field as distinguished from the structures now commonlyused where the tubular housing In is permanently secured to the brackets and the brackets are bolted to the screen box so that such a reversal involves a considerable operation.

As shown in Figure 1, the tubular housing In is counterbored' to provide a shoulder against .housing is closed by means of a threaded cover plate I 8 which is sealed against the end of the housing in the same way as is the cover plate 20 which is screwed into the other end of the housing. This latter cover plate is shown in greater detail in Figures 3 and 4 and the manner in which the sealing is effected for both ends will be described in connection therewith. The shaft l9. as shown in Figure 1, is provided with a collar 2| held thereon by a set screw as shown and constructed to form a telescoping fit with the complementarily shaped outer face of the cover 20 to form a labyrinth which aids in keeping dust out of the housing. The end 22 of the shaft is adapted to receive a driving pulley or other operating device. The outer face of the end covers I8 and 2| are provided with a series of radial notches 23 whichare-adapted to receive a latch 24 which may be locked by means of a nut 25. The tubular housing In is provided with a threaded aperture which is closed by means of a plug 34 which is normally in the full line position shown in Figure 1.

When it is desired to empty the oil from the housing the collars 5 are loosened and expanded by a bolt 8, as previously explained, when neces-' sary so that the housing may be readily rotated in the collar after the latches 24 havebeen withdrawn from the notches 23. The housing I 0 is then rotated so that the plugged opening is in the dotted position, afterwhich the plug is removed and the oil drained from the housing. It is then rotated back to its original position and the housing refilled with oil. To facilitate the gauging of the amount of oil in the housing a gauge plug 35 is provided in the end s'cover Hi. This plug is removed during filling and when the oil appears at the opening the proper amount of oil is present. The two plugs are replaced and the tube locked by positioning it so that the latches 24 will fit into adjacent notches and the split collars are then drawn up tight.

In order to effect a good seal between the end covers and the housings, each end cover is provided with a flanged edge, see Figure 4, the face of which is provided with a sharp annular ridge 3| opposed to a sirnflar ridge 29 formed on the ends of the housing. Interposed betweenthese is a washer 30 of suitable material, such as fibre, which is squeezed between these ridges when the end cover is drawn up tight. In the construction illustrated in Figure 4, the inner ter minal end of the end cover is also provided with an annular ridge, shown by the reference numeral 28, which engages the adjacent sides of the outer bearing race l2. These parts are so proportioned that just before the ridge 28 engages the bearing race the washer 30 is contacted by the ridges 29 and 3|. As the end cover is drawn up to tightly engage the hearing race the Washer 30 is tightly gripped between the ridges, as is clearly illustrated in Figure 4. As shown particularly in Figure 3, where cover l8, while sealed against the end of the housing ID, as explained in connection with the other end cover, does not have its inner terminal end engaging the adjacent bearing. This bearing is secured in the housing in any suitable way as by means of a push fit. However, when desired, the construction at the left hand end may be employed at the right hand end as employed in Figure 5. In this case a ring 33 is secured against a shoulder in the housing and the outer race l5 of the right hand bearing is held against it by means of the annular ridge 32 formed on the inner end of the right hand end cover l8. In this case the parts are proportioned as before to effect the desired functions, and room for shaft expansion or contraction is then provided for at opposite end,

A particular advantage of the construction as shown in Figure 3, where a sharp ridge in the end cover seals against the outer race of the bearing, is found in the fact that the ridge contact will flatten to some extent against the race, always assuring a perfect oil seal at the fibre gasket.

It is, of course, apparent that the rings H and 33 can be omitted when desired and a thicker tubular housing counterbored to form shoulders against which the end covers can force the outer races of the bearings to lock them in place.

By means of the constructions at the ends of the housing as explained it is possible to practically ensure against the seepage of oil from the housing and the entry of dust thereinto.

From the above description it will be apparent In the construction shown in Figure 1, the endto those skilled in this art that the various details of construction disclosed herein as comprising thi invention may be varied without departure from the novel ideas of this invention. We do not, therefore, wish to be limited to the specific forms illustrated in the drawing but rather to the scope of the appended claims.

What we claim is:

1. In a vibratory screen, the combination in.- cluding a screen box, a pair of brackets mounted on said box having split collars, a vibratory unit including a tubular housing in which an unbalanced shaft is rotatably mounted, said unit being supported on said brackets in said collars, and means for drawing said collars tightly about said housing to lock it in place.

2. In a vibratory screen, the combination including a screen box, a pair of brackets mounted on said box having split collars, a vibratory unit supported on said brackets in said collars, means for drawing said collars tightly about said unit to lock it in place, and means including latches mounted on said brackets for engaging the ends of said unit to further lock it against rotation.

3. In a vibratory screen, the combination ineluding a screen box, a pair of bracket. to the opposite sides of said box, said having split collars, a vibratory unit musing comprising a tube mounted in said collars, leal'is for drawing said collars tight to lock tube in place, said tube having an aperture in as wall thereof, and means for closing said ape rt said tubular housing being rotatable in said. collars when loosened so that the housing may be drained of lubricating oil.

4. In a vibratory screen, the combine eluding a screen box, a pair of bracke to the opposite sides or said box, said having split collars. a vibratory unit comprising a tube mounted in said colla .1. for drawing said collars tight to lock t i. place, said tube having an aperture in thereof, means for closing said aperture, said tubular housing being rotatable in said collars when loosened so that the housing may be drained of lubricating oil, and means for gauging the amount of oil in said housing.

GUSTAVE A. OVERSTROM. CONRAD OVERSTR GEORGE OVERS'I'ROM. 

